Preparation method of propylene random copolymer

A technology of random copolymer and propylene, which is applied in the field of propylene random copolymer and its preparation, which can solve the problem of sticking and agglomerating residual monomers that are difficult to remove cleanly, reduce the melting point and crystallinity of polypropylene resin, and affect product processing and application issues, to achieve the effect of low room temperature xylene soluble content, high relative dispersion, and not easy to stick to the roll

Active Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Propylene random copolymer usually refers to a polymer obtained by randomly copolymerizing a small amount of α-olefin monomer (usually not more than 15wt%) on the polypropylene molecular chain, because the copolymerized monomer destroys the arrangement of the propylene monomer on the molecular chain Therefore, the melting point and crystallinity of polypropylene resin are reduced. The lower melting point enables it to be used to make films that are easier to heat seal. The lower crystallinity improves the transparency of the material, but the amount of comonomer The increase of soluble matter wi

Method used

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  • Preparation method of propylene random copolymer
  • Preparation method of propylene random copolymer
  • Preparation method of propylene random copolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Polymerization was carried out on a set of pilot plant. Its main equipment includes pre-complexation reactor, pre-polymerization reactor and loop reactor. Polymerization method and steps are as follows:

[0064] (1) Pre-complexation reaction:

[0065] The main catalyst (titanium-containing active solid catalyst component) is obtained by the method described in Example 1 of Chinese Patent CN1258683A, wherein the internal electron donor compound adopts diisobutyl phthalate, and the Ti content of the main catalyst obtained is 1.93wt %, magnesium 19.8wt%, diisobutyl phthalate content 9.3wt%.

[0066] The main catalyst, co-catalyst (triethylaluminum), and external electron donor (methylcyclohexyldimethoxysilane) are respectively added to a jacketed continuous stirring tank through different pipelines for pre-complexation reaction, pre-complexation The temperature is controlled at 8°C by the jacket water, each reaction medium is fed at the bottom and overflowed, and the co...

Embodiment 2

[0075] With embodiment 1, just change catalyst pre-complexation time. The polymerization conditions and polymer properties are shown in Table 1.

Embodiment 3

[0077] With embodiment 1, just change butene-1 addition, H 2 Addition amount and catalyst pre-complexation time. The polymerization conditions and polymer properties are shown in Table 1.

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Abstract

The invention relates to a preparation method of a propylene-butylene-1 random copolymer. The preparation method comprises a step that the propylene-butylene-1 random copolymer is obtained through carrying out a copolymerization reaction of propylene and butylene-1 by adjusting the addition amount of the copolymerization monomer butylene-1 in a reactor at a polymerization temperature under a proper hydrogen content in the presence of a selected Ziegler-Natta catalyst. The preparation method has an easy polymerization process and can avoid the appearance of sticky kettle, caking, incompletely-removed residual monomers and the like, and the prepared propylene-butylene-1 random copolymer has a high relative butylene-1 dispersion degree and a low room-temperature xylene soluble substance content.

Description

technical field [0001] The invention relates to a propylene random copolymer and a preparation method thereof, in particular to a propylene-butene-1 random copolymer and a preparation method thereof. Background technique [0002] Propylene random copolymer usually refers to a polymer obtained by randomly copolymerizing a small amount of α-olefin monomer (usually not more than 15wt%) on the polypropylene molecular chain, because the copolymerized monomer destroys the arrangement of the propylene monomer on the molecular chain Therefore, the melting point and crystallinity of polypropylene resin are reduced. The lower melting point enables it to be used to make films that are easier to heat seal. The lower crystallinity improves the transparency of the material, but the amount of comonomer The increase of soluble matter will increase the content of soluble matter. The soluble matter does not crystallize at room temperature and is easy to migrate to the surface of the product, ...

Claims

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Application Information

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IPC IPC(8): C08F210/06C08F210/08C08F4/646
Inventor 宋文波张丽英侯莉萍魏文俊张浩唐毓婧
Owner CHINA PETROLEUM & CHEM CORP
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